Insulating-tube.



GFAI'J' Fesses@ Y HOUSE ELECTIC Aim sxpyamaw Brit-am, and ai-residntvt Iittsburgg-in the county of Allegheny and State of Pennsylvaina, havea-ineent-ed a new and useful Improvementin Insnlating-lhibes,. of `u'hich the following is a specification.

My invention rela-tes :totfinsulating tubes or bushings 'and it has specialV reference to so-called condenser-type insulating bushings, such as that shown and described in Patent .No. 952,5135 granted March E22, 1910 to the IVestinghonse Electric & Manufacturing Co., upon an application tiled by James C. Dow.

The object of my invention is to provide a structure, of the class above indicated, that shall comprise a plurality of sections so arranged that the insulating properties of the tube or bushings are not impaired, in order that bushings of comparatively` great length may be constructed with a minimum expense.

It is sometimes desirable to make an insulating sleeve or bushing of such great length that it is very diiiicult to utilize the method of construction set forth in Patent No. 858.385, granted July 2, 1907 to the Westinghouse Electric & Manufa@turingl C0.,4 upon an application tiled by lilmil I-Iaefely, for the reason that the length of y'the mandrel and the Width oit' the paper tss must equal the length of the tube desired.

IAccording to my present invention, I ntilize the Haefely methodand I interpose lay ers of conducting .material at suitable intervals, asset forth in the Dow Patent, above referred to.' When I have made several comparatively short tubes in the manner specified, I prepare the ends of one member by cutting a series of steps thereon and hollow .out the adjacent end of the member which is to be assembled next to it so that the one may tit into the other, the ends of the conducting layers of adjacent members being brought together so that the continuit-y of the conducting plates may be maintained.

Figure 1 of the accompanying drawings is an elevation of a tube or bushing constructed in accordance with my invention. Fig. 2 is a similar View of a portion of the same bushing withv its segments slightly separated in order to make the form of each ,PF- stresses realisieren Y as M NU aefrnnind copieren" t asimiladas-eef.'

i Specification df Lette'rslaten't. g.. Alipnat-ionmed 4rune e, 1910. seriallndaeeuoa lateiited Ee section clean Fig. Il i' I a larger scale, otra. traga shown in Figs. 1.-.and 2, andfillu. trau arrangement of insulating;l layers at the` joints vfbetiveei Fig.V -l isa similar-A segments are shown' in thein as sition instead of slightly7 Fig. 3'.- a- 1.

yReferringto the dran. igs;n V atm tube or bushing here shown comprises `a pluralityv of segments 17 2 and 3, each oi which is built up of alternate layers i and 5 of insulating and conducting materials, as shoxvn lin Figs. 3 and i. The ends of the segment 1 are stepped by turning oil the insulating layers at unequal lengths so as to expose the ends of the conducting layers and at the same time keep them separated by a surface distance greater than the direct distance between them. The innermost insulating la'vers of segment 1 are longest, each layer being sliorter than the one directly within it, as shown in Fig. l. Sect-ion 2 of the insulator is stepped at one end but at the opposite end it is holloived out so that the stepped end of section 1 may tit into it.

The arrangement' of layers at the joint is shown in Figs. 3 and 4. Itis evident that the diameters of the conducting layers for the two sections which are connected are unequal, this 'arrangement being preferable in order to provide a greater surface distance between adjacent conducting layers. The electrical connection between conductors is established b v bending back the edges of the conducting plates where they extend beyond the noncenducting layers, those of one section being bentoutyv'irdly and those of the adjacent section inwardly so that/they may be brought {irmly into engagement With each other when the tivo sections are assembled, as shown in et.

The joint between sections 3 and 2 is sinnlar to that between sections 2 and l and therefore need not be described in detail. Other sections may obviously be added, Within the spirit and scope of my 'invei'it-lon, and the .structure lnay be otherwise modified to suitthe conditions of service and the volt-V age for which the tube is intended to 1nsulate.

I claim as my invention: 1. An insulating tube or bushing comprisinsulating and conducting materials, the conducting layers of adjacent sections being severally connected when the sections are assembled.

3. An insulating tube or bushing comprising a plurality of telescoping sections having stepped engaging surfaces, each section comprising alternate layers of insulating and conducting materials and the ends of the conducting layers being so formed as to establish electrical connections between the. conducting layers of adjacent sections when the sections are assembled.

4. An insulating tube or bushing comprising a plurality of telescoping sections severally consisting of alternate conducting and sections each l insulating layers, the ends ofthe conducting layers being bent laterally across the adjacent ends of insulating layers to make contact with each other when the sections are assembled. 4

5. An insulating tube or bushing compris ing a plurality of telescoping sections severally consisting of alternate conductin and insulating layers, the adjacent ends o conducting-layers being bent laterally in opposite directions across the ends of insulating layers to make Contact with each other when the sections are assembled.

v In testimony whereof, I have hereunto subscribed. my name this 27th dayof May,

CHARLES LE G. FORTESCUE.

[itnesses R. J DnamioniaI B. B. HINEs. 

